Lichen "rings"

Nancy Harrison nanharrison at
Tue Oct 31 08:30:26 EST 1995

I need references on relation between lichen growth on trunks of Red Fir
and Hemlock in the Sierra-Cascade ranges and mean snowfall levels.
Anyone done any work on this? Field experience? Please e-mail info to
vulpia at or nanharrison at, or reply here. Thanks!
-Nan in Calif

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